Commercial Interior: Walls Masonry | Concrete – Installing Drywall

Drywall is installed over InSoFast panels in the same exact way it is installed over traditional framing. Simply attach drywall to the InSoFast studs using all-purpose coarse drywall screws. Type W Bugle Head Screws attach single layer gypsum panels to InSoFast framing. Screws provide greater holding power than wallboard nails, minimize popping and help prevent damage to the panels. You should nail base and trim boards into the studs using trim nailer or hand nails.

Important: InSoFast panels, like all rigid foam insulation boards, are required by code to be covered by ½” drywall or any other approved 15-minute thermal barrier (IBC 2603.4). If using an alternative finish, check with your local building code official to make sure it meets requirements.

Things to keep in mind

When installing InSoFast in a corner, be sure to solidly back the panel’s edges that don’t end in studs. See (Corners, Intersecting Walls) for more details.

Drywall Alternatives

Important: InSoFast panels are manufactured using a flame retardant foam and are classified as rigid foam plastic insulation. They fall into the same class as pink, blue and yellow insulation boards which are required by code to be covered by ½” drywall or any other approved 15-minute thermal barrier (IBC 2603.4). If choosing an alternative to drywall it is important to check with your local building code official to make sure it meets your local requirements.

There are numerous types of finishes that are designed for or can applied to the InSoFast panels. The following is a short list of links to finish materials and application instructions.